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try chem12 spray. Clean mas, then spray into intake manofold w/engine runnign at 2k rpm. Check for oil leak in spark plug recesses causes a miss that the computer picks up and tries to balance.Did this to my car. it works

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Related Questions:

I WOULD REPLACE DISTRIBUTOR CAP AND ROTOR.MARK LOCATION OF ROTOR OR MAKE NOTE SO YOU CAN INSTALL NEW ROTOR IN CORRECT FIRING POSITION. IF THIS CAR HAS A LOT OF MILES I WOULD REPLACE DISTRIBUTOR CAP, ROTOR.SPARK PLUGS AND WIRES.REPLACE IGNITION COIL.CLEAN FUEL INJECTORS, FILL GAS TANK UP TO 3/4 TO FULL TANK OF GAS POUR CAN SEAFOAM IN FUEL TANK IT WILL FLUSH OUT THE FUEL INJECTORS WHILE ENGINE RUNNING OR DRIVING CAR. REPLACE FUEL FILTER. REASON I SAY DO A TUNE UP PROBLEM COULD BE MINOR FIX.COULD NEED TUNE UP.IF TUNE UP DONT HELP THEN YOUR PROBLEM IS DISTRIBUTOR OR THE CAMSHAFT SENSOR INSIDE OF DISTRIBUTOR.THAT WOULD SET OFF CHECK ENGINE LIGHT.BUT I WOULD SAY TUNE UP COULD FIX PROBLEM.

Hi, from experience its more likely it is the spark plugs and/or wires.
Maybe even the distributor cracked. At night pop the hood start the car look around the wires and cap look for blue / white arking.

Check all of your tune-up parts. (Distributor Cap, Distributor Rotor, Spark Plugs and Spark Plug Wires) Also perform a compression test if no problem is found with the tune-up parts. Check also for vacuum leaks and the Intake Air Control Valve (IAC) for the "won't idle" problem.

Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps

This could be a problem with plugs, wires, distributors, fuel filter or fuel injectors. Try changing the plugs and wires first, then the fuel filter. If you are changing the plugs and wires, make sue you use anti seizing compound and dielectric grease.

Try basic tune up (SPARK PLUG WIRES, Spark Plugs, Distributor CAP, Rotor) and adjust timing if you know how. This is the basic place to start. I this doesn't work then we move on. A GOOD tune up goes along way.